Pillow/Tests/test_lib_image.py

from __future__ import annotations

import pytest

from PIL import Image


def test_setmode() -> None:
    im = Image.new("L", (1, 1), 255)
    im.im.setmode("1")
    assert im.im.getpixel((0, 0)) == 255
    im.im.setmode("L")
    assert im.im.getpixel((0, 0)) == 255

    im = Image.new("1", (1, 1), 1)
    im.im.setmode("L")
    assert im.im.getpixel((0, 0)) == 255
    im.im.setmode("1")
    assert im.im.getpixel((0, 0)) == 255

    im = Image.new("RGB", (1, 1), (1, 2, 3))
    im.im.setmode("RGB")
    assert im.im.getpixel((0, 0)) == (1, 2, 3)
    im.im.setmode("RGBA")
    assert im.im.getpixel((0, 0)) == (1, 2, 3, 255)
    im.im.setmode("RGBX")
    assert im.im.getpixel((0, 0)) == (1, 2, 3, 255)
    im.im.setmode("RGB")
    assert im.im.getpixel((0, 0)) == (1, 2, 3)

    with pytest.raises(ValueError):
        im.im.setmode("L")
    with pytest.raises(ValueError):
        im.im.setmode("RGBABCDE")


@pytest.mark.parametrize("mode", Image.MODES)
def test_equal(mode):
    num_img_bytes = len(Image.new(mode, (2, 2)).tobytes())
    data = bytes(range(ord("A"), ord("A") + num_img_bytes))
    img_a = Image.frombytes(mode, (2, 2), data)
    img_b = Image.frombytes(mode, (2, 2), data)
    assert img_a.tobytes() == img_b.tobytes()
    assert img_a.im == img_b.im


@pytest.mark.parametrize("mode", Image.MODES)
def test_not_equal(mode):
    num_img_bytes = len(Image.new(mode, (2, 2)).tobytes())
    data_a = bytes(range(ord("A"), ord("A") + num_img_bytes))
    data_b = bytes(range(ord("Z"), ord("Z") - num_img_bytes, -1))
    img_a = Image.frombytes(mode, (2, 2), data_a)
    img_b = Image.frombytes(mode, (2, 2), data_b)
    assert img_a.tobytes() != img_b.tobytes()
    assert img_a.im != img_b.im